Product classification
HS code for Magnesite bricks: 6815.91
Stone articles and articles of other mineral substances, containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite.
Classification of magnesite bricks under HS 6815.91
Magnesite bricks are classified under HS code 6815.91 when they are composed of magnesite, magnesia (periclase), or dolomite but do not meet the criteria for refractory goods classified in Chapter 69. Heading 6815 covers articles of stone or other mineral substances not elsewhere specified. Subheading 6815.91 specifically identifies articles containing magnesite, magnesia in the form of periclase, dolomite (including dolime), or chromite. The distinction often depends on whether the bricks have been fired at high temperatures to achieve a ceramic bond. If the bricks are chemically bonded or unfired, they remain in Chapter 68. However, if they are fired refractory bricks used for lining furnaces, they are frequently scrutinized against Heading 6902. The presence of magnesium oxide (MgO) is the primary chemical marker for this classification. These articles are used in industrial applications where resistance to basic slags and high temperatures is required, such as in the steel and cement industries. The classification ensures that non-ceramic mineral products are grouped separately from traditional fired ceramics, focusing on the mineralogical composition rather than just the heat-resistant properties.
- Covers
- Unfired magnesite-based bricks
- Chemically bonded magnesia-chrome bricks
- Articles containing periclase for industrial lining
- Dolomite-based mineral blocks
- Non-refractory magnesite shapes for construction
- Also under 6815.91
- RHI Magnesita refractory bricks (unfired)
- Vesuvius refractory masses
- Magnezit Group products
- Calderys monolithic refractories
Codes often confused with 6815.91
Common mistake. Magnesite bricks are most often misclassified under 6902.10, which covers refractory bricks containing more than 50% MgO, CaO, or Cr2O3. The difference lies in the manufacturing process; Chapter 69 requires the articles to be fired as ceramics. Another misclassification is 2519, which is for the raw mineral magnesite or magnesium oxide. If the material has been shaped into a specific article like a brick, it must move from Chapter 25 to Chapter 68 or 69.
Top exporters and importers of HS 681591 (the code used for magnesite bricks), 2025
In 2025, the largest exporter of HS 681591 (the code used for magnesite bricks) in UN Comtrade data was China, with 58% of world exports; the largest importer in UN Comtrade data was Germany, with 9.0% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 681591, not only magnesite bricks.
Top exporters 2025 · share of world exports
- 1 China $454M 58% of world exports
- 2 Austria $94M 12% of world exports
- 3 Spain $50M 6.3% of world exports
World total: $781M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Germany $69M 9.0% of world imports
- 2 Italy $68M 8.8% of world imports
- 3 Japan $60M 7.8% of world imports
World total: $768M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM codes for magnesite bricks
Brazil splits HS 6815.91 into 2 NCM codes. Pick the one that matches your product:
- 6815.91.10Unfired bonded magnesite/dolomite/chromite items
- 6815.91.90Other magnesite, dolomite or chromite articles
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about magnesite bricks
What is the HS code for Magnesite bricks?
The HS code for Magnesite bricks is 681591 (Stone articles and articles of other mineral substances; containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite). The HS code for articles containing magnesite, magnesia, or dolomite (including bricks) is 6815.91.
How do I classify Magnesite bricks for customs?
Magnesite bricks is classified under HS code 681591 — Stone articles and articles of other mineral substances; containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite. This is a 6-digit subheading level code.
Are all heat-resistant bricks classified here?
No, most fired refractory bricks used in furnaces are classified under Heading 6902; 6815.91 is for specific mineral compositions that are often unfired or chemically bonded.
Which countries are the top exporters of magnesite bricks (HS 681591)?
In 2025, the top exporters of HS 681591 (the code used for magnesite bricks) in UN Comtrade data were China ($454M, 58% of world exports), Austria ($94M) and Spain ($50M). World exports came to about $781M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of magnesite bricks (HS 681591)?
In 2025, the top importers of HS 681591 (the code used for magnesite bricks) in UN Comtrade data were Germany ($69M, 9.0% of world imports), Italy ($68M) and Japan ($60M). World imports came to about $768M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Magnesite bricks the same in all countries?
The base HS code 681591 for Magnesite bricks is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for magnesite bricks in Brazil?
Brazil splits HS 681591 into 2 NCM codes, so the right one for magnesite bricks depends on the product's details: 6815.91.10 (Unfired bonded magnesite/dolomite/chromite items), 6815.91.90 (Other magnesite, dolomite or chromite articles).